User manual HANNA INSTRUMENTS HI 4010

[. . . ] HI 4110 FLUORIDE COMBINATION HI 4010 Instruction Manual HI 4010 HI 4110 Fluoride Ion Selective Electrode Half-cell Combination 1 FLUORIDE HI 4010 Fluoride Half-cell HI 4110 Fluoride Combination Electrode I. Introduction: The Hanna HI 4010 and HI 4110 are ion selective electrodes designed for the measurement of fluoride ions in aqueous solutions. The HI 4010 is a solid state half-cell sensor that requires a separate reference. The HI 4110 is a combination ion selective electrode. [. . . ] Place sensor and reference electrodes into electrode holder and connect cable connectors to meter. Unwrap plastic film seal found over ceramic junction on inner stem and discard. This is only used for shipping and long term storage. Open the glass vial that contains the fluoride module (HI 4110-51) and remove from container. Ensure the o-ring is installed on module before screwing into inner stem. Due to shipping or storage the internal solution inside the module may have developed an air pocket near the membrane. Gently shaking the sensor down (like the old style mercury thermometer) will place the internal solution next to the membrane. Note: When inverted, an air pocket will be visible inside the sensor which is normal. Rinse inner stem with deionized water making certain to wet the o-ring found on the inner stem. 8 Deionized Water Remove Parafilm Install sensing module 6. Reassemble electrode by gently pushing the inner assembly into the outer body, sliding spring down cable, and screwing cap into place. DO NOT TOUCH OR PUT PRESSURE ON LANTHANUM CRYSTAL. Remove fill hole cover and o-ring on fill hole spout. Using the dropper pipette provided, add a few drops of HI 7075 fill solution to the electrode, wetting the oring and rinsing out the fill solution chamber. 9 9. Holding the body of the electrode gently press upper cap with your thumb. This permits the fill solution to drain out of the body. Release cap and verify electrode returns to its original position (you may need to gently assist for this to occur). 10. Tighten the electrode cap onto the body and fill electrode body until fill solution volume is just below fill hole. Position electrode in a Hanna HI 76404 electrode holder (or equivalent) and connect plug to meter. · · · · · · Quick Check of Electrode Slope Connect sensors to pH/mV/ISE meter. Place 100 mL of deionized water into a beaker with stir bar. Place the electrodes into prepared sample. Add 1 mL of a standard (0. 1 M or 1000 ppm standard) to beaker. [. . . ] Water used for standards must be fluoride free and sensors and glassware must be rinsed repeatedly with this water to prevent carry over. 5 mL (Vstd) of 10-3M (Cstd) standard is added to the beaker and the mV value decreases. The unknown fluoride concentration in the original sample (Csample) can then be determined by the following equation. Csample = CstandardVstandard (VT)10E/S - (VS') VS' Vsample (Vsample+Vstandard+VISA)= VT (Vsample+VISA)= VS' 3. The procedure can be repeated with a second standard addition to verify slope and operation of the method. [. . . ]